vitamin A2

American

noun

a yellow oil, C 20 H 28 O, similar to vitamin A, obtained from fish liver.

vitamin A2 British

noun

Also called: dehydroretinol. a vitamin that occurs in the tissues of freshwater fish and has a function similar to that of vitamin A. Formula: C 20 H 28 O

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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Chemically, Cyp27c1 makes a small modification on the molecule of the form of Vitamin A called Vitamin A1 to turn it into Vitamin A2, shifting sensitivity of eye photoreceptors to longer wavelengths such as red and infrared light.

From Reuters

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023